OPPO change theme screen lock notice is not displayed.

If the screen lock interface does not display the notification content, you need to "enter to view the message content". I suggest you try the following methods:

Go to settings > notification and status bar > notification management > screen lock notification > display notification content (turn on this switch) or long press the WeChat icon >; Application information > notification management > lock screen to hide notification content (turn off this switch) ".

Tips:

The "Lock screen to hide notification content" switch will not cause no message reminder, but will replace the message content with "Enter to view message content" in the screen lock interface.

This answer applies to all OPPO models.